My little sister was one of the first to have the measles vaccination - born 1968, so over 50 now.
Edit - it is those born between 1970 - 1979 who only got the measles vaccine. Don't know why they are less likely to have immunity against mumps and rubella than over 50s though - we all had rubella vaccine at 12 anyway so that leaves mumps.
https://www.nhs.uk/conditions/vaccinations/mmr-vaccine/MMR for non-immune adults
The MMR vaccine can also be given on the NHS to adults who may need it.
This includes:
people born between 1970 and 1979, who may have only been vaccinated against measles
people born from 1980 to 1990, who may not be protected against mumps
Check with your GP if you're not sure whether you have had the MMR vaccine.
If in doubt, go ahead and have it. Even if you have had it before, it won't harm you to have a second, or even third, course of the vaccination.
Read more about when the MMR vaccine is needed.
Find out why some teenagers should have the MMR vaccination.
Get advice on how to protect yourself and your family if there's a measles outbreak.
Read the NHS leaflet Measles: not just a kids' problem (PDF, 868kb).