1. Do you feel like you have as much flexibility and athleticism as your Pre-LL self?
No. It's about 80-90%.
2. Do your leg joints ever ache more than usual and do you have fears of early arthritis? I just worry about being able to do something as simple as sitting on a wooden floor without pain.
My joints do not ache and I don't have fears of early arthritis. All the issues seem to be with the muscles, tendons, and ligaments; not in the joints' cartilage.
3. How did you explain you height increase post-puberty to your friends and family? Did they believe your fib if you used one?
A few select people I told about the surgery because I had no way of hiding it from them, notably my mother. She blabbed to a lot of other family members about it, and her lack of discretion with my secret was shocking. So that contaminated a lot of possibilities for saying I grew. A few people on the other side of the family whom I hardly ever saw (once every 5 years or so) noticed I had gotten taller and believed that I had grown between age 20 when they had last seen me and age 25 when they first saw me post-LL. At least, they didn't verbally express their disbelief.
If you have a lot of friends and family that you see regularly, either tell them you're doing the surgery or ghost them and go start a new life after LL. Or better yet, keep your social circle and don't get LL. It's really weird for someone to get taller suddently, and people are very cognizant of others' height. This forum wouldn't exist if height wasn't an extremely noticeable physical attribute.
Most of the time you will not get away with fibbing to anyone who knew you as a short guy, so don't try or else they'll think you're a liar as well as someone who got LL. And keep in mind if those people know each other, the topic of your height increase will probably come up when you're not there.
4. Did you get any stretch marks on your legs from the lengthening?
LL did not cause any stretch marks.
5. Is there any advice you could give me that you wish you had known before getting the surgery and recovery?
It will probably take longer than you think to get back to normal, and it's very physically and mentally draining, especially during lengthening. There's no way I could have worked or studied during lengthening, and I slept for 12 hours a night for over a year after doing LL.
6. If you could talk to your younger self, would you still tell him to go forward with the surgery?
The answer is still yes, but we'll see. I'm noticing more tightness in my legs now in my late 30s, 12 years after doing the surgery.