get on vs mature

To become old. 

To handle, cope or manage (over time); to perform or make progress. 

To board or mount (something), especially a vehicle. 

To become late. 

To have a good relationship; to get along. 

To commence (an action). 

To progress (with). 

To make (someone) mature. 

To attain maturity, to become mature or ripe. 

To make (something, e.g. fruit) ripe or mature. 

To proceed toward maturity: full development or completion (either of concrete or of abstract things, e.g. plans, judgments, qualities). 

To proceed toward or become mature or full-grown, either physically or psychologically; to gain experience or wisdom with age. 

To bring (something) to maturity, full development, or completion. 

To reach the date when payment is due.