<span style="color:#ff0000;">He is eighty five.</span><br/><br/><span style="color:#800080;">1-That is too old to play tennis.</span><br/><span style="color:#800080;">2-It is too old to play tennis.</span><br/><br/><span style="color:#800080;">3-That is too old to be playing tennis.</span><br/><span style="color:#800080;">4-It is too old to be playing tennis</span>.<br/><br/>Are sentences 1-4 acceptable in this context?<br/>Is there any difference between their meanings?<br/><br/>Gratefully,<br/>Navi.