37 is not objectively "old" for a man, but it's a significant life stage with varying perspectives.
Societal and Statistical Context
Statistically, 37 is the median age of men in America and roughly halfway to the average life expectancy (76). [Source: MensHealth.com - When Is Middle Age For Men?] This means many men are at a similar life point, neither young nor elderly. However, perceptions of age are subjective and vary widely. Some may consider 37 young, while others view it as middle-aged.
Several sources mention the perspectives of dating and relationships. One Reddit thread suggests that for dating purposes, 26 and up might be a reasonable age range for a 37-year-old man to consider [Source: Reddit - Realistically, what age is too young for a 37 year old male?]. However, age is not the sole factor determining relationship compatibility; shared values, goals, and mutual enjoyment are equally important [Source: Quora - What age of women should a 37-year-old man date?].
Other sources highlight the individual experiences of men at 37. Some men may feel they still have time for many life experiences and possibilities [Source: Quora - I need a definitive answer, at 37 am I young or old…can I still be crazy like a teenager], while others may reflect on where they are in life and goals yet to be achieved [Source: Quora - I'm 37 years old and still a single man. Is it too late for me?].
Conclusion
The perception of whether 37 is "old" is subjective. While statistically it represents a midpoint in life for many American men, individual experiences and perspectives widely vary.