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.
This is a doubling of the original investment amount. The maturity ages for bonds issued between May 1995 and May 2003 is 17 years. The maturity for bonds issued from March 1993 until April 1994 is 18 years. Bonds issued between November 1986 and February 1993 matured in 12 years.