Pinkdevil is right in my opinion. The age gap shouldn't make much of a difference.
this is good for me, because its difficult to find a new old female for my male.
now i have 4 pairs and 3 young.
I had a pair, that was excellent, every year produced healthy babies but unfortunately the male died before 2 years (20 yo) and mate the female with another male.
Last year layed 5 eggs and produced 3 babies but until now havent any egg, their age is about 20 yo.
my second pair hadnt ever good results, they also about 20 yo, this year layed 5 eggs but no any bird, i take the eggs and maybe lay others, i am waiting.
my third pair ( 16yo the male, 5 the female ) has 3 eggs but i am not sure for the results because they hadnt good relationship, this is the pair that i mention before.
and the fourth pare ( 5 and 5 yo) layed last year 5 eggs with a baby - lazaros, now they have 3 eggs, i wait something good from they
but the male last months is a plucker and i am not sure for the results.
As you see the situation isnt good.
I am thinking to buy 2 new females, but this is enough complicated because i cant find females here.
the females i have are from holland and i think i must import ( via plane) the 2 females from holland again.
as i conclude the consequential in a pair is the personality of birds, like human.
there are good parents and not good , there are good couples and divorses too, the same for the birds too.