I think that is the only way to get to the overlook. Only about 10-20 minutes, but yes, it does have some inclines. I did see elderly people walk it, they just went slower. I saw one guy probably around mid-80s and not in the best condition make it, he just went very slow. Slow and careful, if they're mobile, they can do it.

I found this information in the internet. Hope this helps. The Peyto Lake and Bow Summit area will now remain open to visitors until mid-August 2019. At that time, the entire area – including parking lots, restrooms, trails and viewpoints – will close for improvements for the remainder of the year. Start dates remain dependent on weather and contractor availability. We will continue to provide updates as timelines are confirmed. Thank you for your patience while we improve the quality and reliability of national park experiences and safeguard these special places for the future.

45 kms according to Google maps

Was here 5 days ago. And with the prevailing weather , yes it would be accessible for this month.

Do you know if it’s upper or lower parking lot renovations? If it is upper you can hike the main road up as that is what everyone in the winter has to do anyways. If it’s lower you likely will be able to park on the side of the highway or at the entrance way into the parking area and again hike up the main road leading to the viewpoint. Hope this helps!

In the Banff National Park booklet, it says that the Bow Summit Parking will be closed as soon as April 2019 for repairs. I visited in April 2019, and it was still open, though impacted with snow. I would recommend checking back in here closer to your departure. My guess is that they will begin repairs once the snow melts.

Roads are only ploughed once per day in winter. None of service areas remain open. Know no more......

Most altitudes in the Canadian Rockies are not that extreme. You should not have any problems unless you have abnormal respiratory problems. Bow Summit is the highest point on that highway and it 6800 feet.

When we were there the end of may part of the trail was snow covered . If the snow has disappeared it is actually a paved path to the wooden lookout so you could push a stroller. The parking lot was not paved though , the path that we used started at the far end of the parking lot . I understand there is another path that starts near the washrooms and goes to the same look off , not sure if it is paved. The one we took is about a 10 minutes walk in but worth it .