What you probably want to do is to set the Default font to a larger point size. Then anything you type will be that size, and anything you paste will if pasted unformatted (Edit > Paste Special > Unformatted ...) pick up and use the larger font.
1 Set the Default font to, say, 14 points. Start Writer > File > New > Text document. DO NOT TYPE ANYTHING - just go F11to open the Styles and Formatting pop-up window. Go to the Paragraph Styles tab. Right-click Default > Modify ... which opens the next window. Go to the Font tab and choose the font and size you want. Click OK.
2 You now need to save this as the Default template so it is always used when you create a new document. See [Tutorial] Creating a new default template which says:
1 From the File menu, choose Templates -> Save.
2 Give the template a name - perhaps BigFont
3 Select a category in the Categories list (for example, My Templates).
4 Click OK to save the template.
5 Choose File -> Templates -> Organize.
6 In the Categories list, double-click on the My Templates folder.
7 Right-click on BigFont and choose Set as Default Template from the menu.
8 Click the Close button.
Thought (not know for sure) this took care of words I pasted from other sources so I always have large 18 point font in documents (eg. online articles) but having just set this up again after a new win7 install, much to my surprise when I paste some words onto a document they keep the same online small font size.
Please enlighten me on how to be sure I can make all pasted words & letters the 18 point size & need to be able to easily read new documents.
Thanks again guys, Jim