Look the number in the able and find the age with magic.
To know one’s age by number at table, ask your friend to see his/her age in the table given. You can tell him/her age by knowing the number in the table which he/she shows.
Your friend told his/her age is in T1, T3 & T4. We can tell his/her age is 13.
Add the 1st number of each table friend had said & add them together. The sum will be the age of the friend would then be known.