A very bright and sunny day
The priest did to the verger say:
"Last Monday met I strangers three
None of which were known to thee.
I ask'd them of their age combin'd
Which amounted twice to thine!
A riddle now will I give thee:
Tell me what their ages be!"

So the verger ask'd the priest:
"Give to me a clue at least!"
"Keep thy mind and ears awake,
And see what thou of this can make.
Their ages multiplied make plenty,
Fifty and ten dozens twenty."

The verger had a sleepless night
To try to get their ages right.
"I almost found the answer right.
Please shed on it a little light."
"A little clue I give to thee,
I'm older than all strangers three."
After but a little while
The verger answered with a smile:
"Inside my head has rung a bell.
Now I know the answer well!"

Now, the question is:
How old is the priest?