I'm probably being rude, not politically correct, insensitive blah blah etc etc but here goes anyway .... if you are 48, I hope you are a very fit 48 year old. The Dispatch job can be very demanding physically. After 15 years of rushing around at Heathrow, I gracefully "retired" to a more sedentary job to give my knees a rest, aged about 40.
It may be that the service companies have a different approach to the job. My roster was 7/3; 7/4 and by the 7th day and countless 30ft climbs of the airstairs to Jumbo aircraft doors during the week made me a tad tired. The 8th day was a washout.
It's probably just me but worth giving it a thought all the same.
Best of luck anyway.