In addition, singing can be an effective way to keep your mind and body sharp. With a little dedication and a lot of hard work, anyone of any age can learn to sing. There are many studies that show that music and singing classes in old age can be healthy for both physical and psychological reasons. I highly recommend this route for those who want to learn more about how singing fits into the huge world of music.
If you want to sing very demanding technical pieces like opera or if you want to sing professionally, there may be a time limit, but at 28 you are not even close to that. Choirs are a phenomenal group activity recognized for their ability to make large groups of people enjoy singing and creating music together. These factors directly affect the voice, but there are many other changes you can expect to see after age 50 that also affect singing, such as atrophy of muscle and nerve tissues and changes in chemicals responsible for nerve transmission. I'm 28 years old and I've always loved singing along with music, but of course, I sounded as horrible as you imagine a singer without training to sing.
I can't play the same notes as someone like Mariah Carey, but I've definitely improved my comfortable singing range in both directions, and I can help you do the same. When your singing joy becomes the desire to sing more professionally, then you have to put on your business cap. Also consider watching one of the many free video lessons on Barbara's YOU TUBE channel, Singing After 40, here. If you've ever sung in the shower, hummed your favorite song Top 40 on the radio, or tried to sing the lead and background vocals of “Bohemian Rhapsody”, you're already a singer.
If you want to see someone who can't sing at all and isn't ashamed of it, listen to anything from William Shatner from Star-Trek fame. But you can still sing a lot of wonderful music if you keep your voice and body in a reasonably good shape.