Depends which country you are likely to most work with though. The US and the UK tend to have different fashions in names.
Here is Jason in the US over time: biggest in the 70s (like the UK) but pretty popular in the 80s too, and then dropped right off. Jackson on the other hand is a much more modern name. Looks like Jacksons would be teenagers or younger.
The same graph for Alan has a very different picture, with a drop in popularity just when Jason was big.
Interestingly I think that would be very similar in the UK, Alans mostly 60+ and Jason popular for 35-45 year olds. Unfortunately the nice charts for the UK only go back to 1996.
Other names with 80s peaks look to be Andrew, Matthew, Geoffrey, Adam and Joshua (in the States anyway)