Q1:

S₁: The art of growing old is one which the passage of time has forced upon my attention.

P : One of these is undue absorption in the past.

Q : One's thought must be directed to the future and to things about which there is something to be done.

R : Psychologically, there are two dangers to be guarded against in old age.

S : It does not do to live in memories, in regrets for the good old days, or in sadness about friend who are dead.

S₆: This is not always easy one's own past is gradually increasing weight.

The Proper sequence should be:

Question

S₁:	The art of growing old is one which the passage of time has forced upon my attention.
P :	One of these is undue absorption in the past.
Q :	One's thought must be directed to the future and to things about which there is something to be done.
R :	Psychologically, there are two dangers to be guarded against in old age.
S :	It does not do to live in memories, in regrets for the good old days, or in sadness about friend who are dead.
S₆:	This is not always easy one's own past is gradually increasing weight.

The Proper sequence should be:

Ordering of Sentences