There IS no 'exact' answer to this and my comments about not taking vitamin d on days that you sunbathe are mainly in reference to those who have good levels and who are maintaining their good levels.
If you are 'grossly' deficient, then sunbathing and taking supplements for a couple of months is not going to cause you to overdose. Because everyone's vitamin d requirements are different, because I don't know what your vitamin d level is and because everyone's definition of 'plenty' of sunlight is different and most often entirely meaningless (people define 'plenty' anywhere from sunbathing in the Arizona desert nude for an hour a day in the hot summer sun to getting 2 minutes of sunlight on their face in the dead of winter in Alaska), because everyone's skin tone is different (Michael Jordan might need up to 20 times longer in the sun than Gweneth Paltrow to get the same amount of vitamin D), and because older people don't convert vitamin d from the sun as well as younger people- the only good answer that I can give you is to get 'enough' sunlight and supplements to bring your vitamin d levels up to optimum levels.
Assuming that you really are sunbathing in the hot midday sun with full body sun exposure, being 75 you are likely going to be getting 10,000 IU's per day or less of vitamin d from the sun. And 20,000 IU's per day for 2 or 3 months is NOT going to cause any problems...
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