1 Small residential projects tend to cost more per square foot and may be subject to a minimum charge of $500-$1,000 or more. 2  Resurfacing an average 500-square-foot concrete driveway typically costs $2,000-$5,000. ThisOldHouse.com estimates it took two people five hours and six bags ($150-$180) of material to resurface a 9'x27' driveway and a 3'x18' walkway (about 300 square feet). 2  Renting a pressure washer to clean the existing concrete before resurfacing can add $40-$75 to the total DIY costs.
At what point you declare someone mentally mature is hard to define but given that wisdom from life experience would be a good indicator of maturity then the age of someone would imply more life experience. It depends if they have learnt from it I guess.
Quick Answer. While the exact age is hard to pinpoint, most human males finish growing physically in their early 20s. Many boys achieve complete physical maturity by the middle to late teens, while others continue to experience changes for a few more years. Continue Reading.