How old does my plant look?

Hey, I got given these plants today and I don't know how old they are. How old would you say?
I am aware of the light stress, if you have any ways I can prevent these it would be much appreciated.

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i would guess 3 weeks +

Thanks, how long till they go into bud? is that at 6 weeks?

Lets get stoned said:

Thanks, how long till they go into bud? is that at 6 weeks?

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I have the same guess 3 weeks of vegetation

Actually after fourth week many strains start to show the pre flowers, between the week 6 and 4 you should see the pre flowers and start the flowering if you start from seed!!
IF your plants are clones the pre flowers should appear with 4 weeks of veg in most of the strains
I highly recommend wait until the pre flowers to start the flowering

Okay, thanks.