I’m 25, is it too early to transplant? (photo)

No it is not too early as you are now 25 and your pattern should be generally known by now. The corners are easy to transplant and the area behind the middle frontal hairline is thinning from the photo view. The entire area can be transplanted easily with FUE, about 1300 grafts might do it. You should take finasteride to prevent shock loss and the advancement of the loss process especially if you get it transplanted.