Few look forward to old age and all that it brings in its wake - deteriorating health, loss of vigour, restricted mobility, increasing dependence on others, not to mention a sense of foreboding and anxiety. Yet, one has to learn to cope with the onset of old age. Firstly, it is imperative to prepare to accept old age in spite of the restrictions or limitations it imposes on one's mobility. Equally important is the need to adopt a positive attitude towards life. _______________ Above all, peace of mind, is the efficacious balm that brings equanimity toone's life. We must resign ourselves to growing old, and in the process let us try to make life as fulfilling and meaningful as possible.

The paragraph, in the second half of itself, talks about how should one cope with the onset of old age. It mentions the following points:

1. Prepare to accept old age in spite of the restrictions it imposes on one's mobility.
2. Having a positive attitude towards life.
3. ___
4. Peace of mind.
5. Submitting ourselves to the old age.
   

Option B and C can be eliminated as they cannot be points of advice. Option A cannot be supported by the author since it mentions 'grim realities'. The author specifically mentions 'having a positive attitude towards life', so he/she cannot put forth the idea that reality is or can be grim. Option D is likely the correct answer, as it expands upon the points, advising someone to turn to nostalgia and recall the 'good old days'.