Transplanting Mid or Late Veg?

I’d like to transplant to larger pots as I got a new , larger tent and now need to veg a little longer to fill the space. Is there a point when it’s too late or the plants are too old?? I’m in 3 gal now, around week 7 from sprout.

As long as you’re not in flower. Transplant her, give her some time to recover and switch to flower when you feel they’re big enough.