I've only had a proper interest in photography for a few years so I'm pretty new to it and was a bit daunted by going along to my local photographic society because I was worried they'd all be old men that had been doing film photography for 50 years and know everything there is to know. I guess some clubs might be like that but I was lucky enough to find that there are some really nice and friendly members who arrange regular outings and share advice. There is a definate devide in the club between the older stuck in the mud members that are very traditional and the not necessarily younger but certainly more modern members. At 33 I am one of the younger members but there is a bit of a mix across all ages.
My advice would be the same as everyone else, go along and give it a try and if you find it's not for you then try another club as they are not all the same. With a bit of luck you'll find one you like with people that'll help you settle in and progress your photography. One thing I would advise is that when you do go along, make it clear to them that you are new, you're keen to join and you want to learn. See what feedback you get. If it is positive and they are welcoming then it's a good sign that you'll enjoy it there.