Contiki is amazing, I just did 2 Europe in may and Thailand in June. Your age is not a factor but just be prepared to be hammed for the duration of your trip. Alot of it depends on the group you are with obviously but its pretty much the norm that if you go on Contiki, you are pretty down to earth and fun.
It is really well put together and allows you to maximize your time in Europe. For me personally we were up at 7am at the latest every morning on our way to see sights then at night its team dinners and party. Most everything is optional except traveling to different places.
I highly recommend Contiki, you will have a blast
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