Thought I'd follow up with my experience of Sharks back in June.
Frankly, 1 word. Unbelievable.
I went on my own back in June, my first solo euro trip with the intention to go specifically to Sharks.
Spent both my days there (27th - 28th June - a Thursday and Friday) from around midday onwards up until 9pm-11pm ish. Friday was absolutely the busiest day, easily double or triple the amount of people in there than the Thursday, however Friday was the better day also in terms of stunning totty. There was an astonishing amount of women walking around, easily 80+ girls, possibly more.
On the punting side I managed to get through around 1500EUR via a selection of women. I had a few threesomes with some absolute stunners, and I mean literally some of the best looking women I've seen in my life. Most if not all were Romanian, there were a few from Brazil too, but most were Eastern European. As it was warm in June, most of the punters were walking around just with towels around their waists. The girls were for the most part completely naked, nothing but tits, fanny and ass on display from the get go. Some girls were more pushy than others, clearly exercising their entrepreneurial skills, this included grabbing hold of your crotch, licking and biting your ears, and just generally smooth talking to get you to take them to a room. My advice is to really scan the environment, take your time and then go in for the one you want. The main bar had stools lining both sides, and this is generally where most of the most attractive WGs were sat. The girls sat here were ice cold at times, and some actually dismissed my advances which can be disheartening considering you expect to pick who you want, but alas, this can also happen at Artemis in Berlin also. Don't take it personally, just move on, chill for a bit or make yourself comfortable on the sofas, and they'll come right over to you in their own time.
All the girls started at 100 EUR for 30 mins, with extras at 50 EUR a piece (some wanted 50 for OWO, others provided it as part of the fee), 50 EUR again for CIM. So you are looking at 300 EUR for threesomes with the goodies.
Go in expecting that the whole place is an exchange of business and your needs will be met and you'll leave happy.
Amenities, well, it was really warm out, they had the BBQ going ALL day on the Friday, and I mean ALL day. Absolutely incredible selection of BBQ meats on display, lean steak, chicken, pork etc straight off the grill. Sharks is incredible value for money if all you intend to do is visit and make use of the amenities all day and not actually punt. I used the jacuzzi upstairs often after my shower following a punt. It was perfect for watching the Euros whilst relaxing. Every now and again, you'd get the scrotter gypsy girl trying to lure you out of the jacuzzi. These were the ones looking for business upstairs and on the cheaper end of the scale that would do everything for 50 EUR, I didn't touch these. I did get talking to a couple of german lads in the jacuzzi, and I stuck with one in particular at the bar and we exchanged some beers and small talk about life and business etc which made my time there even better. There was a huge outdoor area with wooden huts and given the weather, most were outside and playing in the pool and on sun beds. The wooden huts, the doors were swinging off their hinges with willing punters, not a care was given about the happenings going on just a few metres from where you were lounging.
Soft drinks, coffee etc are all included in the entrance fee, beer, cocktails etc were extra but certainly not extortionate, around 6 EUR per beer. You have a wristband that they give you that the bar maid scans and you settle up on your way out, just mentally keep a tally of what you are spending. There were cash machines (x2) on site and lockers to secure your stuff.
By the end, I'd generally decided which girls I liked the best and kept on going back to them. All in all, I had a great time at Sharks and would absolutely go back once I've replenished my funds. Keep things real, know you're there to do business and you'll have a great time.
If you have any questions I'm more than happy to answer them.
Oh and as for older guys being there (50+), there were plenty, some clearly regulars but the women were all on the younger side, 18-35 I'd say. There were perhaps one or two older WGs (40+) that I found caught the eye of plenty of men.