I hope you don't mind my interjection
Montica, With children, the younger the better. None of my children are the norm, apparently .. must be their upbringing

My youngest grandchildren are 2.5 and 6.5
The 2.5 recognizes me equally in older photos where I'm young pre-everything, older-pre (where I'm just old

), pre-overweight with a full beard, pre lost weight without beard, and with my current 1 year changes.
The 6 yr old had no problems to speak of. I am now Papa or Mrs Papa whichever happens to come out. Obviously a little more aware of changes still, now distress just curiosity and acceptance.
I have two older grandchildren, both 14 that are ok with it. The 14 yr old boy grew up with us from birth until 7, I was surrogate father in those years and still looked at that way. He simply says, it's a little weird, it's ok though.
The 14 year old girl I call the import (affectionately). Shes my son-in-laws daughter from a previous marriage. They got custody 2-3 years ago. When she first met me, pre, she was scared of me. I was solidly in my depressed bitter angry mode of unknowing. Then when I started to change she thought weird (weird seems to be a common theme when children first learn). Now she enjoys my company. I think she likes the fact that I understand some of what she's going through, we are both the same age for hormone charged emotions

My 3 children range 26 - 32. They are all OK with it. Sure they had to come to terms in their own way as anyone would. My oldest brags about me, she usually starts with "My Dad's a girl"

. I recently found out that my 2nd daughter is very defensive of me and get very mad at anyone that presents a slight to me.
My son, the youngest, Oh he's just like, "Eh, whatever as long as you're happy"
Getting into my nieces, Their first comments were, "COOL!"

Ok, I dragged this out. My point is, adults get more confused than young'uns do. It's the parent of the children passing their confused worry on to them.
The 'man fading away' That's hard. My wife is struggling real hard with it. Her man isn't just fading away at this point, he's gone.
Got to run
OH, sex life.. yeah, different for everyone .. right now I don't have one. That doesn't mean that it'll happen to you. A lot of it depends on both of your approaches to the changes.
Faith