my 2 year old son does the same thing. i'm grateful that he stays in his bed until 3 most nights! :)
honestly, you rarely see teenagers still sleeping with their parents. :) i'm joking, but i would guess he'll grow out of it. my son climbs in our bed earlier in the night when something's going on with him (getting sick, rough day, growth spurt, development milestone approaching, etc.). we talk to him about the importance of staying in his bed all night, and he gets it a lot of the time.
like i said, we know it won't last forever, so we're trying to enjoy it as best we can since it is short-lived and it doesn't disturb us. in fact, it's nice not to get up in the night to fight about getting back in bed, then try to fall back to sleep myself.
good luck! yes, you will eventually sleep alone!