Can i still grow after 20 years??

Im really hoping the growth is right on par with where they should be, i ordered off amazon and recieved yesterday a set of stage specific fertilizer/nutrient system by "Big Blooms & Buds" i used the N-P-K 5-4-2 growth stage per the directions i diluted the amount it called for, by less dilution of the directed amount each time , i could slowly introduce this to them in hopes of preventing any form of stress. They remain in my greenhouse with supplemented LCD full spectrum grow lights which run 12 hours a day the plants leaves have this slight upwards point during the day . I also keep 2 fans on high 12 hours as well as 10 open windows in the greenhouse, temps run from 60 to 90 degrees Fahrenheit the lesser being night time temps. I only water when the top inch or 2 of soil is dry and when my plants show a slight droop in there leaves, when i do water everything drains perfectly and im sure to use a very small watering can. I only began using fertilizer when my plants reached 15 days old to which i used "Alaska" brand step one for vegetation, leaf, stem and root, this i also diluted to prevent any burn or shock. I am really dedicated to these girls and hope it pays off in the long run.