program not uploading

As the title states, not uploading. Arduino NANO, IDE V1.8.11, power light is on, "L", LED is flashing, under "tools" shows NANO and port COM5. Very basic program shown below (which compiles) tries 10 times to upload.

/*
Connection Setup

8 COLUMNS
PIN COLUMN
2 ====== C1
3 ====== C2
4 ====== C3
5 ====== C4
6 ====== C5
7 ====== C6
8 ====== C7
9 ====== C8

4 TIERS
T1 IS TOP TIER
PIN TIER/COLOR
A0 ==== T1
A1 ==== T2
A2 ==== T3
A3 ==== T4
*/

int column[6]={2,3,4,5,6,7}; //DECLARING COLUMN TO PIN ASSIGNMENT.
int tier[4]={A0,A1,A2,A3}; //DECLARING TIER TO PIN ASSIGNMENT.

int ledTimeOn1=15;
int ledTimeOff1=15;
int ledTimeOn2=50;
int ledTimeOff=50;
int ledTimeOn3=150;
int ledTimeOff3=150;
int ledTimeOn4=300;
int ledTimeOff4=300;

void setup() { // sets tiers and columns to output.
for(int c=0; c<6; c++)
pinMode(column

,OUTPUT);
  for(int t=0; t<4; t++)  
   pinMode(tier[t],OUTPUT);  
}

void loop() {
 for(int c=0; c<6; c++)
   {
     digitalWrite(column[c], 0);  // turns the columns low.
   } 
  for(int t=0; t<4; t++)
   {
     digitalWrite(tier[t], 1);  
     delay(ledTimeOn3);
     digitalWrite(tier[t], 0);  
     delay(ledTimeOff3);
   }  

}

I believe problem started when I upgraded to 1.8.11 but not sure. I may have done a different unit with .11 can't remember.

Below is error message.

Arduino: 1.8.11 (Windows 10), Board: "Arduino Nano, ATmega328P"

Sketch uses 1106 bytes (3%) of program storage space. Maximum is 30720 bytes.
Global variables use 29 bytes (1%) of dynamic memory, leaving 2019 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x4d
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x4d
Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Small window on lower right of Arduino screen says "Arduino nano on COM5"

Any info appreciated.

(deleted)

Sorry, I don't see anything like that?? Should mention , I can upload the "Blink" program from the library
to a Uno I have with no problem. Thanks for responding.

(deleted)

Thank you, I,ll try that. The program loaded to my Uno with no problem. Tried 3 Nano's with same result.
They are a couple of years old, is that the problem?? thanks again.

(deleted)

Thank you, that was it. Another note to myself.

(deleted)