Is blood pressure of 135 over 100 in a 29 year old high?
No, it is high. The 135 isn't too bad but the 100 is definitely
high. An ideal blood pressure would be 120/80 but 130/90 it the
upper limit of normal.
You need to consider the conditions under which your blood
pressure was taken. Under extremes of stress, eating certain foods
and other conditions everyone's blood pressure goes up. Also, there
are proper body positions combined with the blood pressure meter
position to get accurate readings.
If the readings you gave are consistent when measured repeatedly
for a few days and at different times of the day I would discuss it
with your doctor.
See link below for ranges of blood pressure