Your never too old
The edges, the circumference, the border, the limits, the frame, the margins, the fringes, the extremities, the periphery, the perimeter...
Finite
The act of restricting, or state of being restricted; confinement within limits or bounds., That which restricts; limitation; restraint; as, restrictions on trade.
It depends on where you are located.
There are generally no limits to having a best guy friend. If he is truly your friend it will be just like having a best girl friend. He might not want to get a makeover with you though.
Limits give upper and lower bounds for integration. One simple example is in finding an enclosed area. The upper and lower limits form vertical lines which enclose an area between the function and the x-axis and then integration from the lower limit (smaller x boundary) to the upper limit (larger x boundary).
bounds
Phyllis Bounds Detiege's birth name is Phyllis Bounds.
A common synonym is "borders" although border has a connotation of the separation between areas as opposed to boundaries being the limits, bounds, or confines of a region or set. Other plural synonyms used in various contexts include perimeters, edges, extents, outlines, or sides.
In American Football, if a player has one foot out of bounds when he catches the football, he is out of bounds. If he has is in bounds when he catches the football then he caught it and it is a completed catch. If the player goes out of bounds and comes back in bounds and catches the football it is still an incomplete pass. However, if he was knocked out of bounds or if the ball was tipped, it may be a completed pass. The rules keep changing at all levels of the game.
Rules vary from state to state but in this case it is perfectly legal. So along as the players feet are in bounds. In highschool football its normally if one foot is in bounds and the other is not out of bounds and the player has control of the ball then its a catch