It's important to remember that people learn in different ways, so if these tips don't work for you don't be disheartened.

I find it easier to remember narrative songs so there is the story to fall back on. Writing them out helps, and especially piecing the song together by transcribing from a recording, rather than simply trying to memorise a printed lyric.

For me, repetition is the key. I'll sing it over and over again, and at the same time I may be working on an accompaniment. If it's from a recording, I'll play it in the car and sing along. It can take a long time, and sometimes by the time I've got it I may be getting fed up with it. That's fine, I let it rest for a while and come back to it. It takes time and perseverance, but if it's a song you want to sing it will be worth it.

No doubt it does get harder with age, but don't let that be an excuse. Keeping your mind active is apparently one of the most important protections against mental decline.