I haven't been to a party for many years, so can't help you with the current mix of punters. However, I do recollect many older, fatter, balding guys getting stuck in and the girls giving attention to anyone who wanted it. I have no reason to believe it would be different today. Older paunchy guys are the cash cows for most WGs I'd say so, if any girl had a problem with that, then she wouldn't make much of a living.
Get stuck in, mate, and enjoy it!