No due to heavy lifting some machines they are unable to apply
Yes, they can also volunteer
yes but not likely as a paid staff as they are always looking for volunteers and will aid you in looking for new work, or getting a paid job within the business and I know of two ex volunteers that achieve paid positions while most leave to find paid work after a few months - years
Yes, they can work for volunteers at the age of 16. When I work the British Heart, I only work for a day because of the lockdown during November.