I think during the day from 11am when the place opens until late afternoon you’ll see a mix of guys including middle aged ones. There’s no set day though when you might have more guys than others, it’s just whoever is in on the day. I don’t think you’ll feel out of place whichever day you go on. When I went for the first time, I felt at ease straight away, it’s a very relaxed environment and there are no expectations on you, you can just quietly mooch about and get a feel for the place, get used to the layout. Might be difficult for you to find someone who would escort you in but I wouldn’t worry, you’ll be ok. The staff are very friendly and will explain things to you if you have any questions. Good luck and enjoy yourself.