How did YOU learn to LD? - Part II

I’ve only had lucid dreams a handful of times but I’ve never been able to take control even though I’m aware that I’m dreaming. How do you learn to control things?

Also, I’ve been trying to perfect my sleep patterns and found a sleep calculator(https://startsleeping.org/sleep-calculator/) that includes age, which none of the other ones seem to have. Apparently that’s the biggest determining factor. Is that true?