Is it actually any cheaper to have a mortgage?
Rent
Pay your rent.
For this, you get a roof over your head, and your repairs are (or should be!) done for you.
downside - some places don't let you decorate how you want to and if you're in private rented, you can be asked to leave.
You don't ever own the property.
Mortgage
you pay your mortgage
and buildings insurance
and are responsible for all repairs
you own your house after the purchase price plus all the interest has been paid off.
by which time you are quite elderly and may need to sell it again to pay for your care.
Assuming you don't, you basically pay off your mortgage and die. So your kids inherit.
I would love someone to work out how much a house of, say £150, 000 ACTUALLY costs. the £150,000 + interest on the £150,000 + buildings insurance + average cost of repairs + any legal fees etc + factor in at least one move...
and compare that to rent x X years.
(I'd do it myself but I am shit at maths)
Seems to me that at the end of the day, the financial benefit of having a mortgage as opposed to renting is really your children's. Not yours. And the only real benefit is that providing you pay your mortgage, you won't be asked to leave.
And you can choose what colour to paint your walls.
And whether to have one cat or ten 
It seems to me it's more about perceived freedom than finances.