Often we will have someone come in for a restringing and ask for 55lbs because "my friend strings their's at 55lbs."
The main thing to keep in mind is that 60lbs can feel very, very different depending on the racket being strung. For example, the new Wilson Clash has a recommended tension range of 48-55lbs. The old Wilson BLX 3 has a range of 53-63lbs. A tension of 55lbs on the Clash is the maximum suggested and will feel quite tight. On the BLX 3, it will be at the low end of the range and will play looser and more powerful.
When comparing tensions that others use, check the tension range (which is stamped on most rackets) on their racket and figure out how tight or lose it is strung based on that. That will give you a better measure than the actual tension will.
