Hi

I don't know if it's a matter of losing abilities or losing facility. The muscles you are using in the larynx are very small, and you are using them on and off every day for speech, so it's not as if you haven't done anything at all for a year. You may find that initially they don't respond to singing use so quickly or efficiently. The body is remarkable though, and work will probably bring you back up to scratch.

As your body ages, the responses come back more slowly, so it does depend on how old you are too. A singing athlete does have a longer career than a sports athlete or a dancer, or should have if they use their instrument well. So I should just get stuck in.

I am a singing teacher, and I would advise you to work with someone who has well trained ears and can help you get back on track.