1) It is a misconception that every sage will attain certain powers/siddhi.
The Ultimate aim of any spiritual practice/saadhana is to reach a transcendental state or ABSOLUTE BLISS, wherein the sage will remain unperturbed by good/bad, happiness/sadness, etc.
नान्यं गुणेभ्यः कर्तारं यदा द्रष्टानुपश्यति।
गुणेभ्यश्च परं वेत्ति मद्भावं सोऽधिगच्छति।।14.19।।
When the witness sees none other than the alities as the agent, and knows that which is superior [i.e. different from.] to the alities, he attains My nature.
समदुःखसुखः स्वस्थः समलोष्टाश्मकाञ्चनः।
He to whom sorrow and happiness are alike, who is established in his own Self, to whom a lump of earth, iron and gold are the same, to whom the agreeable and the disagreeable are the same, who is wise, to whom censure and his own praise are the same;
2) A sage may attain Siddhi/powers or may be attain powers parallel to attaining ABSOLUTE BLISS, according to prarabdha (stored merit) of that body.
Sri Shirdi Sai and Sri Ramana Maharshi both attained ABSOLUTE BLISS. While Shri Shirdi Sai exhibited powers, Sri Ramana Maharshi did not.
Further, the sages will give least importance to the powers and always advised their disciples to steer away from desiring/acquiring powers, which are nothing before the ABSOLUTE BLISS.
3) When a sage attains an ABSOLUTE BLISS, which is also called the God/TIME, there will be no bar as to how far they can travel in time. Again the rider is if they wish so.
The sages will treat the past as nothing but ashes, and dwelling in the past events, according to their advice, does not serve any purpose.