I only started playing S1 not long before S2 was released and I have to say that it hooked me pretty much straight away. The ease of navigating the menus to setting up your car (although that is still a black art to me to get it right!).
Now, at 34 and with a family, LFS is perfect for the quick half hour race every now and then. There's no way that I could afford the time of 2 - 3 hours of going through qualifying and then a full blown 30 or 40 lap race (the idea of doing this is very attractive though - I just think a divorce would probably be on the table before I knew it!). When you've got a family, priorities are in other areas and LFS allows many of us a quick fix to de-stress from day-to-day life.
The younger players have the time, patience (generally, not always) and persistance to get good at games. Us "old-uns" have the experience (someone else mentioned this) and use this to our advantage.
Anyway, young or old, we all enjoy our favourite sim and have a blast with it.