Learning a new type now at 61 would not upset me. Hard work will be required but that is what I'm paid for. The clever little whizzy bits will come with time but the basic 'houses get bigger' stuff doesn't change. But with age comes the knowledge and experience that some things are not important and others are not. This enables you to focus on what is critical and then to move on. Slow, stupid? Yes, but I don't take any longer to train than younger colleagues and get through training courses on plan. But if it looks like I'm slowing up I'll start learning the piano, take up juggling and start crapping in a ditch half way up Snowdon to speed up my learning ability.