Experience IS a factor, as in almost anything in life.
BUT, that being said, dont let age distract you! Having a 10 year experience can happen between 15-25 or between 25-35 – its still 10 years of experience! 😉 I hope you get my point! The thing is, not that many people stick to music after their youth regardless what you may think. Growing up exposes some harsh truth on us and most of the people who are in it for the wrong reason, quit! 😉
Lastly, do not let those younger than you intimidate you – a person younger than you by ten years, has 10 less in life experiences which all add up to qualities needed for a DJ like: reading a crowd, having heard lots of music, knowing how to make public relations.
Think of it this way, a younger person than you may have a headstart in DJing experience if he started practising younger than you, but no matter what you will always be more experienced in life than a younger person! This may seem irrelevan to DJing but its not!
Now on to giving specific examples to boost your confidence, I started producing music older than you, and DJing even later, but that hasnt stoped me for pursuing the dream and actually being really close to it! 😉