'See if you can work out my age!
If you add twenty to my age, the number is divisible by my age.
If you add together the tens and units of my age, they make five.'
What is the person's age?
There are six possible ages that would add up to five if you added the tens and units.
Start from there.
Continuing on from hint one...
Look at the six possible ages and see which ones would not be divisible by themselves if they were added to twenty.
The six ages that add up to five if you add the tens and units are: 5, 14, 23, 32, 41 and 50.
The tens place of the age is '0'.
The answer is '5'.