Reasonable suspicion does not apply if a person simply refuses to answer questions or is of a certain ethnicity or race. If a person is suspected of committing a violent crime, such as robbery or murder, the police officer may frisk the suspect's clothing to check for weapons.
Middle age technically refers to reaching an age where you have lived half the average life expectancy for your gender. The average midpoint of life is now about 40 for women and 38 for men (men tend to die 6 to 8 years before women). In comparison, 100 years ago women arrived at middle age by 22, mainly because so many died in childbirth.
Well, maybe it is easier to cope with a midlife crisis if indeed one places such an extreme importance to life that by the time you are 18 years of age you already experience a midlife crisis due to regrets of failure of accomplishments of idealist notions of a well lived teenagehood set of years.