Damn When Did Being in Your 40s Mean your Old"

You know i pride myself on looking good and feeling good for my age,but i see that people be calling people in the 40s old now,im like well damn,when did this happen,i was in the mall the other day at macys,and these young cats was talking,and they was like damn that nigga came to her birthday trying to look young with his old ass nigga like 42 i was damn they act like the nigga was 50.and then i was watching some show and they was like at the old man trying to stay in leauge at age 39 im like well damn am i missing something or has 50 become the new 40,is the new generation trying to make my generation the old geezers or what they got me fucked up cause you only as old as you feel and i be damn i f i feel like im ready for the rocking chair,shit i do more than the average,and i know most of my followers is the 35 to 40 plus crowd,so to my followers dont let this new generation lable you as old when have us is just a young,but wiser indeed.