They are never "too old" in my opinion. Older birds are settled in their ways and less rambunctious, so they might seem like they aren't having fun beating up toys and hanging upside down from things, but they are just wonderful companions.
One of the males I bought 2 years ago, Jackie, has a band but there is no year on the band so we have no idea how old he is. I think he's at least 10 but really have no idea. He is a gorgeous bird with beautiful feathers and beak and a strong flier. A pleasure to watch.
The oldest girl I have is 14. She came to me when she was 12. She had lived alone her first 9 years then spent a couple years in homes where it didn't work out. She was plucking from boredom mostly. Unbelievably, she decided to allow one of my males to get close with her and they have become mates. She acts like a young bird.
Like Peeker said the only way you can know for sure if this male is less than 2 is if the iris of his eyes is still dark, almost as dark as the pupil. Once they are adults, the iris turns yellow, orange or red, depending on the subspecies. Youngsters eyes look big because they are brownish, blending in with the black of the pupil.
Females who are petted like kittens, held all the time and especially those allowed to spend times in dark spaces, are likely to think about raising a family with or without their human friend. Some hens lay eggs regardless, but as long as they are healthy this really is not a problem.
Males that are petted like kittens and held constantly, can decide their owner would make a nice mate and offer to feed them and sometimes want to masterbate on them. Frustrated males often squawk their displeasure if not allowed to have their way, and sometimes bite the person they love.
If you do things with your bird besides stroking them, allow them to fly each day, provide them things to chew and feed them a lean diet there is no reason they will decide to look at you as a mate.
It is a personal thing whether or not you allow or care to have a bird regurgitate for you and rub on you. I don't happen to care for it because I think the bird often ONLY wants to do that. Some males like/need a small stuffed animal to "date". I just find it easier to not encourage them to look at "me" that way.
Here is a great website that explains it much better than I can (the rational parrot -- how not to be a tease)
RP - Mating. It's worth reading regardless what species you own, IMO.
If birds in your country are often parent raised you will have less chance of them being human imprinted, so everything I've said may be moot. It's still good to know how you should behave to help them be a well rounded parrot and lead a rewarding life, I think!
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