My wife flies and I do her rosters.
She has 12 years seniority and she does ok with her roster.The status quo works for us.
Flying is changing because of technology and a few other things.The 60 plus will not be able to cope.There is movement coming whether you believe it or not.
Also FYI there are 45 crew members longhaul who are over 60..There are 3000 who have a seniority of less than 14 years.
A friend of my wifes started in 1992 and her seniority number is 2901.So the majority are not senior.Those with 20 years plus in longhaul are around 800 in number.
Do the maths..you are talking through your sphincter.(as usual)